mx.states.RemoveChild (Flex 3)

Package	mx.states
Class	public class RemoveChild
Inheritance	RemoveChild Object
Implements	IOverride

The RemoveChild class removes a child display object, such as a component, from a container as part of a view state. The child is only removed from the display list, it is not deleted. You use this class in the overrides property of the State class.

MXML Syntax expanded

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The <mx:RemoveChild> tag has the following attributes:

  <mx:RemoveChild
  Properties
  target="null"
  />

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	Property	Defined By
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		prototype : Object [static] A reference to the prototype object of a class or function object.	Object
		target : DisplayObject The child to remove from the view.	RemoveChild

	Method	Defined By
		RemoveChild(target:DisplayObject = null) Constructor.	RemoveChild
		apply(parent:UIComponent):void Applies the override.	RemoveChild
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		initialize():void Initializes the override.	RemoveChild
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		remove(parent:UIComponent):void Removes the override.	RemoveChild
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		toString():String Returns the string representation of the specified object.	Object
		valueOf():Object Returns the primitive value of the specified object.	Object

Property Detail

target

property

public var target:DisplayObject

The child to remove from the view.

Constructor Detail

RemoveChild

()

Constructor

public function RemoveChild(target:DisplayObject = null)

Constructor.

Parameters

target:DisplayObject (default = null) — The child to remove from the view.

Method Detail

apply

()

method

public function apply(parent:UIComponent):void

Applies the override. Flex retains the original value, so that it can restore the value later in the remove() method.

This method is called automatically when the state is entered. It should not be called directly.

Parameters

parent:UIComponent — The parent of the state object containing this override. The override should use this as its target if an explicit target was not specified.

initialize

()

method

public function initialize():void

Initializes the override. Flex calls this method before the first call to the apply() method, so you put one-time initialization code for the override in this method.

Flex calls this method automatically when the state is entered. It should not be called directly.

IOverride interface method; this class implements it as an empty method.

remove

()

method

public function remove(parent:UIComponent):void

Removes the override. The value remembered in the apply() method is restored.

This method is called automatically when the state is entered. It should not be called directly.

Parameters

parent:UIComponent — The parent of the state object containing this override. The override should use this as its target if an explicit target was not specified.

Examples How to use examples

StatesExample.mxml

<?xml version="1.0" ?>
<!-- Simple example to demonstrate the States class. -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

    <!-- Define one view state, in addition to the base state.-->
    <mx:states>
        <mx:State name="Register">
            <mx:AddChild relativeTo="{loginForm}" position="lastChild">
                <mx:target>
                    <mx:FormItem id="confirm" label="Confirm:">
                        <mx:TextInput/>
                    </mx:FormItem>
                </mx:target>
            </mx:AddChild>
            <mx:SetProperty target="{loginPanel}" name="title" value="Register"/>
            <mx:SetProperty target="{loginButton}" name="label" value="Register"/>
            <mx:SetStyle target="{loginButton}" 
                name="color" value="blue"/>
            <mx:RemoveChild target="{registerLink}"/>
            <mx:AddChild relativeTo="{spacer1}" position="before">
                <mx:target>
                    <mx:LinkButton id="loginLink" label="Return to Login" click="currentState=''"/>
                </mx:target>
            </mx:AddChild>
        </mx:State>
    </mx:states>

    <!-- Define a Panel container that defines the login form.-->
    <mx:Panel title="Login" id="loginPanel" 
        horizontalScrollPolicy="off" verticalScrollPolicy="off"
        paddingTop="10" paddingLeft="10" paddingRight="10" paddingBottom="10">

        <mx:Text width="100%" color="blue"
            text="Click the 'Need to Register?' link to change state. Click the 'Return to Login' link to return to the base state."/>

        <mx:Form id="loginForm" >
            <mx:FormItem label="Username:">
                <mx:TextInput/>
            </mx:FormItem>
            <mx:FormItem label="Password:">
                <mx:TextInput/>
            </mx:FormItem>
        </mx:Form>
        <mx:ControlBar>
            <mx:LinkButton id="registerLink"  label="Need to Register?"
                click="currentState='Register'"/>
            <mx:Spacer width="100%" id="spacer1"/>
            <mx:Button label="Login" id="loginButton"/>
        </mx:ControlBar>
    </mx:Panel>
</mx:Application>

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